1 files changed, 67 insertions, 0 deletions
diff --git a/src/boost/libs/mpl/example/integer.cpp b/src/boost/libs/mpl/example/integer.cpp
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+++ b/src/boost/libs/mpl/example/integer.cpp
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+
+// Copyright Aleksey Gurtovoy 2001-2004
+//
+// Distributed under the Boost Software License, Version 1.0. 
+// (See accompanying file LICENSE_1_0.txt or copy at 
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Id$
+// $Date$
+// $Revision$
+
+#include <boost/mpl/multiplies.hpp>
+#include <boost/mpl/list.hpp>
+#include <boost/mpl/lower_bound.hpp>
+#include <boost/mpl/transform_view.hpp>
+#include <boost/mpl/sizeof.hpp>
+#include <boost/mpl/int.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/mpl/base.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/deref.hpp>
+#include <boost/mpl/begin_end.hpp>
+#include <boost/mpl/assert.hpp>
+
+#include <boost/type_traits/is_same.hpp>
+
+namespace mpl = boost::mpl;
+using namespace mpl::placeholders;
+
+template< int bit_size >
+class big_int
+{
+    // ...
+};
+
+template< int bit_size >
+struct integer
+{
+    typedef mpl::list<char,short,int,long> builtins_;
+    typedef typename mpl::base< typename mpl::lower_bound<
+          mpl::transform_view< builtins_
+            , mpl::multiplies< mpl::sizeof_<_1>, mpl::int_<8> >
+            >
+        , mpl::int_<bit_size>
+        >::type >::type iter_;
+
+    typedef typename mpl::end<builtins_>::type last_;
+    typedef typename mpl::eval_if<
+          boost::is_same<iter_,last_>
+        , mpl::identity< big_int<bit_size> >
+        , mpl::deref<iter_>
+        >::type type;
+};
+
+typedef integer<1>::type int1;
+typedef integer<5>::type int5;
+typedef integer<15>::type int15;
+typedef integer<32>::type int32;
+typedef integer<100>::type int100;
+
+BOOST_MPL_ASSERT(( boost::is_same< int1, char > ));
+BOOST_MPL_ASSERT(( boost::is_same< int5, char > ));
+BOOST_MPL_ASSERT(( boost::is_same< int15, short > ));
+BOOST_MPL_ASSERT(( boost::is_same< int32, int > ));
+BOOST_MPL_ASSERT(( boost::is_same< int100, big_int<100> > ));